<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="vue.js"></script>
</head>
<body>
<div id="demo">
    <ul>
        <li v-for="(item,index) in list"    v-userdefined >
            <!--<img v-bind:src="item.url"/>-->
            <div></div>
        </li>
    </ul>

</div>
<style>
    .class-a {
        background: red;
    }

    .class-b {
        background: red;
    }
</style>
<script>
    // 注册一个全局自定义指令 `v-focus`
    Vue.directive('userdefined', { //用户自定义指令
        // 当被绑定的元素插入到 DOM 中时……
        inserted: function (el) {
            // 聚焦元素
            el.addEventListener("click", function(){
                alert(1)
            });
        }
    })

    //创建一个vue的实例
    new Vue({
        el: "#demo",
        data: {
            userDefined:'userDefined',
            classA: true,
            list: [
                {
                    url: 'http://i4.265g.com/images/201902/201902280644122663.jpg'
                },
                {
                    url: 'http://i4.265g.com/images/201902/201902280644122663.jpg'
                },
                {
                    url: 'http://i4.265g.com/images/201902/201902280644122663.jpg'
                },
                {
                    url: 'http://i4.265g.com/images/201902/201902280644122663.jpg'
                },
                {
                    url: 'http://i4.265g.com/images/201902/201902280644122663.jpg'
                },
            ],

        },
        methods: {
            clickEvent(){
                console.log('clickEvent')
            },
            clickEvent1(){
                console.log('clickEvent1')
            }

        },

        beforeCreate(){

        },
        created(){

        },
        beforeMount(){

        },
        mounted: ()=> { //挂载元素，获取到DOM节点

        },
        beforeUpdate(){

        },
        updated(){ //挂载元素，获取到DOM节点
        },
        beforeDestroy(){

        },
        destroyed(){

        },
    })
</script>

</body>
</html>